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2D Structure
Also known as: 89-98-5, O-chlorobenzaldehyde, Chlorobenzaldehyde, Benzaldehyde, 2-chloro-, Benzaldehyde, o-chloro-, 2-chlorbenzaldehyd
Molecular Formula
C7H5ClO
Molecular Weight
140.56  g/mol
InChI Key
FPYUJUBAXZAQNL-UHFFFAOYSA-N
FDA UNII
QHR24X1LXK

1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
2-chlorobenzaldehyde
2.1.2 InChI
InChI=1S/C7H5ClO/c8-7-4-2-1-3-6(7)5-9/h1-5H
2.1.3 InChI Key
FPYUJUBAXZAQNL-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C1=CC=C(C(=C1)C=O)Cl
2.2 Other Identifiers
2.2.1 UNII
QHR24X1LXK
2.3 Synonyms
2.3.1 Depositor-Supplied Synonyms

1. 89-98-5

2. O-chlorobenzaldehyde

3. Chlorobenzaldehyde

4. Benzaldehyde, 2-chloro-

5. Benzaldehyde, O-chloro-

6. 2-chlorbenzaldehyd

7. 2-clorobenzaldeide

8. O-chloorbenzaldehyde

9. 2-chloro-benzaldehyde

10. Usaf M-7

11. 2-chloorbenzaldehyde

12. O-chlorobenzenecarboxaldehyde

13. 2-chloro Benzaldehyde

14. Benzaldehyde,chloro-

15. Nsc 15347

16. 35913-09-8

17. Mfcd00003304

18. Qhr24x1lxk

19. Nsc-15347

20. 2-chlorbenzaldehyd [german]

21. O-chloorbenzaldehyde [dutch]

22. 2-chloorbenzaldehyde [dutch]

23. 2-clorobenzaldeide [italian]

24. Ccris 5991

25. Benzaldehyde, Chloro-

26. Hsdb 2727

27. Einecs 201-956-3

28. Unii-qhr24x1lxk

29. Chlorotoluon

30. Ai3-04254

31. O-chlorobezaldehyde

32. 2-chlorobezaldehyde

33. 6-chlorobenzaldehyde

34. O-chloroformylbenzene

35. O-chloro Benzaldehyde

36. Orthochlorobenzaldehyde

37. 2- Chlorobenzaldehyde

38. 2-chlorobenzenaldehyde

39. Nsc 174140

40. (2-chloro)benzaldehye

41. Ortho-chlorobenzaldehyde

42. (2-chloro)benzaldehyde

43. (2-chloro) Benzaldehyde

44. Wln: Vhr Bg

45. Dsstox_cid_4764

46. Ec 201-956-3

47. 2-chlorobenzaldehyde, 99%

48. Dsstox_rid_77522

49. Dsstox_gsid_24764

50. Schembl97422

51. Mls001056242

52. Chlorobenzaldehyde, O-

53. Chembl1547989

54. Dtxsid5024764

55. Amy39073

56. Nsc15347

57. Str00143

58. Zinc1706909

59. Tox21_200373

60. Stl146016

61. Akos000119188

62. Cs-w003973

63. Cas-89-98-5

64. Ncgc00091218-01

65. Ncgc00091218-02

66. Ncgc00257927-01

67. Smr001216556

68. Ds-006490

69. Ft-0611908

70. Ft-0611909

71. Ft-0658390

72. D77644

73. Q2195231

74. W-100351

75. 2-chlorobenzaldehyde, Purum, Dist., >=98.0% (gc)

76. F2190-0599

2.4 Create Date
2005-03-26
3 Chemical and Physical Properties
Molecular Weight 140.56 g/mol
Molecular Formula C7H5ClO
XLogP32.3
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count1
Rotatable Bond Count1
Exact Mass140.0028925 g/mol
Monoisotopic Mass140.0028925 g/mol
Topological Polar Surface Area17.1 Ų
Heavy Atom Count9
Formal Charge0
Complexity103
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Pharmacology and Biochemistry
4.1 Absorption, Distribution and Excretion

2-Chlorobenzaldehyde might be produced when a moist skin is exposed to the riot control agent CS. CS-hydrolysis to 2-chlorobenzaldehyde and malononitrile occurs both in vitro and in vivo. No quantitative data have thus far been reported with respect to the percutaneous absorption and the cutaneous biotransformation of 2-chlorobenzaldehyde. Percutaneous absorption, biotransformation and elimination of (14)C-labeled 2-chlorobenzaldehyde was investigated in the rat. Following IV (25 uL/kg) and IP (37.5 uL/kg) (14)C-2-chlorobenzaldehyde administration to rats, the plasma radioactivity declined rapidly over a 24 hr period with similar plasma radioactivity-time profiles. Following cutaneous administration (75 uL/kg) in a closed glass-cup on the skin a slow skin penetration occurred as indicated by plasma radioactivity levels. A slow increase in plasma radioactivity was followed by a slow decline of radioactivity in plasma over a 3-day period. Most of the radioactivity was found in the urine with low levels in feces and exhaled air. The cutaneously administered radioactivity was also partly recovered from the glass-cup. For the qualitative and quantitative determination of metabolites in urine, a thin layer chromatography-radioautography method was used. The metabolic patterns of urinary excreted metabolites following cutaneous application and systemic administration of (14)C-2-chlorobenzaldehyde to rats were very similar. No parent compound was recovered from the rat urine. 2-Chlorohippuric acid was the principal urinary metabolite. Quantitatively, the urinary excretion of (14)C-2-chlorobenzyl alcohol following cutaneous application differed substantially from that after the systemic administration. There was no evidence of storage in the skin or skin toxicity of 2-chlorobenzaldehyde following cutaneous application.

PMID:3243317 Rietveld EC et al; Eur J Drug Metab Pharmacokinet 13 (4): 231-40 (1988)


4.2 Metabolism/Metabolites

Main metabolic pathways of o-chlorobenzylidene malononitrile (CS) in rabbits were estimated quantitatively following iv administration. The products of hydrolysis were o-chlorobenzaldehyde (o-Cbald) and malononitrile. The toxic actions of CS can be ascribed to o-Cbald.

Paradowski M; Pol J Pharmacol Pharm 31 (6) 563 (1980)


Male adult Wistar rats dosed i.p. with o-substituted benzaldehydes (o-F, o-Cl, and o-Br = V, VI, and VII) excreted mercapturic acids in urine. These acids were identified as N-acetyl-S-(ortho-substituted benzyl)cysteines (I, II, III). The total mercapturic acid excretion as % dose (2.0 mmol/kg, n = 4) was 1.2 +/- 0.4, 6.8 +/- 0.9, and 10.4 +/- 2.0 for V, VI, and VII. p-Cl-benzaldehyde administered in the same dose showed a non-significant urinary thioether excretion. The aim of the investigation was to prove in vivo a postulated metabolic pathway of substituted benzaldehydes via sulfate esters to mercapturic acids. After a single administration of the sodium salts of o- and p-Cl-benzylsulfuric acid a significant increase in mercapturic acid excretion of 21.2 +/- 1.8% and 14.5 +/- 1.2% of dose (2.0 mmol/kg, n = 4) was found. By pretreatment with pyrazole the mercapturic acid excretion increased after administration of o-Cl-benzyl alcohol (IX) whereas a significant decrease was found after administration of o-Cl-benzaldehyde (VI). After simultaneous administration of ethanol with IX and VI an increase in mercapturic acid excretion was observed. After previous administration of pentachlorophenol a significant decrease in urinary mercapturic acid excretion for IX and VI was found. These findings are in accordance with a metabolic pathway of substituted benzaldehydes via benzyl alcohols, subsequently sulfate esters to the corresponding benzylmercapturic acids.

PMID:6860142 Rietveld EC et al; Arch Toxicol 52 (3) 199-207 (1983)


4.3 Biological Half-Life

In cat blood in vivo, o-chlorobenzaldehyde had /a/ half /life/ of ... 9.5 s.

PMID:4714331 Leadbeater L; Toxicol Appl Pharmacol 25 (1) 101-10 (1973)